DAT6021 4 Channel Thermocouple PLC Input
Contents
1. DAvEXzEL 6000 SERIES ANALOG to DIGITAL INTERFACE UNITS for PLC DATA ACQUISITION USER MANUAL FEATURES Analog Signal Acquisition on PLC digital I O Models and analog inputs DAT6021 4 channels for mV or Thermocouple 16 bits resolution with high F S accuracy Linearization function for Tc and RTD PC and DIP SWITCH configurable 3 ways 2000Vac galvanic isolation In compliance with EMC directives CE mark 12 5 mm thin profile housing DIN rail mounting APPLICATIONS Factory Automation Building Automation Agricolture Automation Chemical Industry Measurement Security system Machine Control DATEXEL preLimiINARY DAT 6000 Introduction The DAT6000 series is an evolution in the connection techniques of the analog signals to the PLC The devices of this serie performs many functions as amplification linearization isolation filtering and conversion of analog signals coming from various sensors in a high resolution digital signal The digital signal is transfered to the PLC by a bus connected to any one of the controller s digital input It is composed by a series of 16 bit words containing the values of the analog signals to be measured The transfer is PLC controlled by a clock signal coming from one of its output ports At every clock pulse a bit of the data is transmitted Using few and simple instructions the PLC is even capable to acquire more analog signal on a si2. end of channel reading I ES OC y DATA a a 1 Ma cues 1 Y CHANNAEL a REGISTER NO X 29 YES read next channel NOTE 1 end of channels reading NOTE 1 to be modified following the number of channels to be read write a 4 for the 4 channels reading NOTE 2 follow the A option to reset the device or for not reading the unused channels The procedure is fast and with few instructions because there are not synchronism controls However if the synchronism is lost i e for a noise the reading will be wrong To avoid that it is advisable to use the ENABLE signal to synchronize the procedure at the reading start 16 DATEXEL pretiminARY DAT 6000 EXAMPLE n 2 2 or 4 channels with synchronism control 8 M 1 4 lt n 0 gt NO read next bit YES end of channel reading m 1 F CHANNEL a 4 REGISTER Definitions ENABLE CLK and DATA interface signals x DELAY SYNC synchronism bit X REGISTER data reading buffer Y n a bit of REGISTER buffer 0 15 DEL CHANNEL digital channel measurement value e or a channel number 1 2 3 or 4 v A bits first channel reading A a 0 DELAY delay
3. Calibration Accuracy RTD Linearity RTD Excitation Current Lead wire resistance influence Thermal Drift Sampling Rate Bandwidth 2 RTD Pt100 Pt1000 Ni100 Ni1000 Resistance and Potentiometer up to 2KOhm 0 1 C for RTD 0 1 Ohm for Resistance 0 1 96 for Potentiometer 0 2 C 0 350 mA typ lt 0 05 Ohm 50 Ohm max for 3 wires RTD 0 005 F S C for RTD 10 samples sec 4Hz DATEXEL pretimiINARY DAT 6000 DAT 6013 DAT 6023 Voltage Channels 2 DAT 6013 4 DAT 6023 Input Type 10V or 20 mA Calibration Accuracy 0 05 Linearity 0 1 Input Impedance gt 1MOhm for V 47 Ohm for mA Thermal Drift 0 005 F S C Sampling Rate 10 samples sec Bandwidth 4Hz For DAT 6023 the input type is not configurable It must be to defined at order V or mA DIGITAL INTERFACE Supply Voltage 24 Vdc typical 30 Vdc max ON state voltage gt 9 Input Impedance ENABLE CLK 4 7 KOhm Minimum Output Load DATA 560 Ohm Maximum Clock signal frequency lt 500 Hz with 1ms filter lt 50 Hz with 10ms filter Debounce Filter settable to 1ms or 10 ms Rise Time lt 0 2 ms SSS ad amp DATEXEL preLimiINARY DAT 6000 SUPPLY Supply Voltage 18 to 30 Supply Current 35 mA 24 Polarity reversal protection 60 Temperature and Humidity Operating Temperature 10 60 Storage Temperature 40 85 Relative Hu
4. function ms The delay time must be i higher than the setting of the digital filter X ee p YES synchronism found READBIT Y 1 x E first bit is the ma ERN I CLK HIGH Y v DELAY READ BIT J Y I x DATA I A v DATA CLK LOW NN wong bit received I gt 1 Y data bit I DELAY I REGISTER read input bit T 1 1 1 1 1 1 1 1 1 1 1 1 1 NO a 2 YES read next channel NOTE 1 nd of channels reading NOTE 1 to be modified following the number of channels to be read write 4 for the 4 channels reading NOTE 2 follow the A option to reset the device or for not reading the unused channels The continuous control of the received bit allow a sure synchronization of the procedure When the synchronism is lost the next reading will be surely correct because it will starts only when a synchronism bit will be recognized It is not necessary to use the ENABLE signal 17 DATEXEL preLimiINARY DAT 6000 Data Format The module acquires the analog signal value of each channel and converts it in a digital string bit Each analog signal is converted in a 16 bit word which is serially transmitted as before described Then it is possible to convert the received string in the corresponding decimal value considering that e
5. lt ENABLE 2 Digital ou 9 lt ENABLES Digital ou 24 DATA Tc 10 lt DAT6021 P e gt Digital in 2 N 3 11 e M e CLK Digital ou A GND A 12 7 O e Ground DATEXEL pretimiNARY DAT 6000 Analog Inputs connection DAT 6011 mV wiring Tc wiring DAT 6021 mV Tc wiring wiring DATEXEL preLimiINARY DAT 6000 DAT 6012 2 wires RTD Res 3 wires RTD Res wiring wiring wiring DATEXEL pnELIMNARY DAT 6000 DAT 6013 V mA wiring wiring NE H GNA DAT 6023 V mA wiring wiring PRELIMINARY DAT 6000 Technical Characteristics Analog Inputs DAT 6011 DAT 6021 Channels Input Type Calibration Accuracy Linearity Lead wire resistance Input impedance Cold Junction Compensation Thermal Drift Sampling Rate Bandwidth nput Min Max 0 mV 450 mV 00 mV 100 mV 00 mV 1000 mV 1000 mV 1000 mV Tes TcS 1767 C 50 1825 C 50 C C 210 1300 C 2 DAT 6011 4 DAT 6021 50 mV to 1V J K T E R t 0 1 FS t 0 2 96 for Tc 0 8 uV Ohm gt 10 MOhm 0 5 0 005 F S G 10 samples sec 4 Hz influence PRELIMINARY DAT 6000 nput ax 850 200 Ni100 180 C 1000 60 C 150 C Min 0 Channels Input Type
6. 25 Go to point 1 Synchronization is failed then disregard the last reading The data acquisition will be delayed until the next synchronism bit will be recognized It is advisable to abort the reading procedure going to point 22 NOTE Tr is the Debounce Filter time setting 1ms or 10 ms 15 DACEXEL pretimiINARY DAT 6000 The following two examples each one toghether with its flow graph illustrate the procedure to be followed for writing the PLC s instructions EXAMPLE n 1 2 or 4 channels reading Definitions ENABLE CLK and DATA interface signals SYNC synchronism bit REGISTER data reading buffer START a bit of REGISTER buffer 0 15 CHANNEL digital channel measurement value Y DELAY a channel number 1 2 3 or 4 ENABLE HIGH X y bits DELAY ENABLE LOW I4 o x DELAY delay function ms The delay time must be higher than the setting of the digital filter Y READ BIT ond Pd a ae n 15 The first bitis the most significant 1 READ BIT _ 5 READ Y Y 7 DELAY REGISTER n j y read input bit CLKLOW V Y n n 1 NOS d DELAY read next bit gt 5 l Y
7. ach value is expressed in signed integer the most significant bit indicates the sign O positive 1 negative The user will must insert the decimal point as illustrated in the following tables Input 50 000 RTD C 850 0 100 00 Res Ohm 2000 0 250 00_ Pot 100 0 1000 0 20 000 Examples Input Binary Hex Decimal Measure Ohm 0000 0000 0000 0001 0001 1 0 1 Ohm 100 mV 0010 0001 0011 0100 2134 8500 85 00 mV 1000 mV 1111 1111 1111 1111 FFFF 1 0 1 mV TcJ 1111 1000 0011 0000 F830 2000 200 0 C 18 DATEXEL pnELIMNARY DAT 6000 NOTE DAT6021 4 Channel Thermocouple PLC Input Phone 1 225 200 7419 E mail Info datexel com Web Site www datexel com
8. e to connect many devices in multidrop connection using few PLC I O ports The power supply of the DAT6000 is isolated from the serial interface so that the auxiliary supply of the PLC can be used to power it DATEXEL preLimiNARY DAT 6000 Multidrop connection The CLK input and the DATA output of the DAT6000 devices are actives only when the ENABLE signal is on Consequently It is possible to connect all the DATA signals to the same PLC digital input and all the CLK signals to the same PLC digital output Devices can be activated one by one sending the ENABLE signal to the selected device only As shown in the figure below using n 3 DAT6000 devices it is possible to read the value of up to 12 analog sensors using only 4 PLC digital outputs and 1 PLC digital input Each new device connected will use only one more PLC digital output ENABLE Changing the device type it is possible to create many combinations of analog inputs i e 4 Tc inputs on the first device 4 mA inputs on the second device and 2 Potentiometer inputs on the third device without to change the wiring to the PLC and the software data reading procedure 1 lt L W Tc2 lt oN DAT6021 e 3 e N 1 M Tc4 lt 0 Tc5 lt N 6021 Tc 7 e 2 Me PLC pi Digital 1 0 8 lt 9 ENABLE 1 L Digital ou
9. ed Moreover the software will provide to program the module in the correct way 13 DATEXEL pRELIMINARy DAT 6000 Data Reading The data transfer is made sending an enabling signal ENABLE and a clock signal CLK If the ENABLE signal is high a bit composing the reading is provided on the output DATA at every clock pulse Every reading cycle is composed of 1 synchronism bit followed of a 16 bit word for each analog input signal channel So that any reading is composed of 33 bits for 2 channels and 65 bits for 4 channels The synchronism bit indicates that the next bit is the most significant bit of the first channel value A15 the following remaining bits of this value will be transmitted down to the least significant bit AO This bit will be followed by the most significant bit of the second channel value B15 down to the least significant bit BO After the last bit a new synchronism bit will be transmitted The value to be transmitted will be updated during the transmission of the synchronism bit During the reading cycle the ENABLE signal must stay at logic level HI The first bit after the ENABLE signal rise front will be a synchronism bit The synchronism bit level is high when the CLK signal is high and is low when the CLK signal is low Differently each data bit is updated on the CLK rise front and mantains its level until the next CLK rise front At any moment it is possible to send a rise front
10. midity not condensing 0 90 EMC Emission EN50081 2 Immunity EN50082 2 RF Immunity tested 10 V m up to 1000 Mhz Housing Material Selfestinguishing Plastic Mounting DIN Rail Weight 50 g approx Dimensions W x Hx T in mm 90 X 98 X 12 5 Mechanical Dimensions mm Ir m mut HE Y N a 11 DAtEXEL pRELIMINARy DAT 6000 How to Program the module The input type is in field configurable by means of the dip switches The input type configuration is made by SW1 SW3 dip switches which can be used to set up to 8 different input types The standard correspondance between the dip switch setting and the relative input type is shown in the tables below It can be modified using the PRO6000 software and the PRODAT 03 interface By this way it is possible to reconfigure the module for a wide range of input signal types at any time Also the CLK signal s digital filter can be set to 1 ms or 10 ms half period duration by a dip switch SW4 The digital filter eliminates all the signal variations shorter than the specified time avoiding undesired command simulations Hereafter the standard tables of the various modules are shown DAT6012 and DAT6013 modules having a limited number of possible input types are availables with a fixed table Whe
11. ngle digital input The devices are also provided of an Enable signal which handled by the controller allows to multiplexing many devices on the same digital input The DAT6000 series is composed of the following devices DAT 6011 DAT 6012 RTD Res and Pot DAT 6023 Em IN gt lt CN ANY PLC DATA or mini PLC DAT6000 DATEXEL DAT 6000 How to connect DA T6000 to PLC DAT 6000 PLC 4 7K 6 p Je f Lu I l lt ENABLE WY al L p O gt 560R ae R EIK 401 r 4 GND V L R n DC DC M j Q 18 30 Vdc VN The serial interface of the DAT 6000 series devices is shown hereup Input and output signals are optoisolated among analog input and power supply The DATA signal circuit is powered directly with the ENABLE signal voltage Without the ENABLE signal the data output is disabled The ENABLE input terminal N can be connected directly to the supply voltage leaving available a PLC output port in this case the data output is always enabled Using the ENABLE signal the CLK signal can be always active because when ENABLE signal is off the microprocessor ignores the clock signal stopping the data sending by this way it is possibl
12. on the ENABLE signal to restart the reading cycle by the synchronism bit The Debounce Filter eliminates all the signal variations shorter than the specified time avoiding undesired command simulations 14 DATEXEL DAT 6000 How to write the PLC s instructions The correct procedure to acquire the measures by the module can be described as following Start condition ENABLE low and CLK low then DATA is automatically low Initialization 1 ENABLE High 2 Wait for Tr Synchronism 3 CLK High 4 Wait for Tr 5 Read DATA 6 DATA logic level must be 1 otherwise go to point 3 7 CLK Low 8 Wait for Tr 9 Read DATA 10 DATA logic level must be 0 otherwise go to point 3 Bit reading 11 CLK High 12 Wait for Tr 13 Read DATA 14 CLK Low 15 Wait for Tr 16 Read DATA 17 DATA logic level read on point 13 and on point 16 must be the same otherwise go to point 3 18 Save the DATA logic level as bit in the reading register Channel reading 19 Repeat points 11 to 18 for all the 16 bits of the measure writing the bits in the reading register from the most significant one down to the least significant one 20 Repeat points 11 to 19 for all the channels to read 21 After the 16 bit of the last channel 2nd or 4th return to point 3 To abort the reading without to read all the channels 22 Be sure the CLK is Low 23 ENABLE Low 24 Wait for Tr
13. reas DAT6011 and DAT6021 are available as in Tab A or in Tab B indicating the choice at the order or in any desired configuration using the software as previously mentioned DAT6023 module is not configurable consequently the input type V or mA must be defined at the order phase DAT6011 DAT 6021 DAT6012 Tab A Tab B Tey 50mV o 0 1 TcK 100 mv 1 500mvV 0 0 IR o 1 TcS IB L3 1 Ten DATEXEL pgELIMNARY DAT 6000 How to create an Input Table All the possible input types of the module are listed in a main table Tab 1 It is possible to associate up to 8 of this input types to each one of the 8 dip switch combinations following the order of Tab 1 and compling to every choosed type the first free dip switch combination By this way the dip switch to input type correspondence table is created Tab 2 The example is referred to DAT6011 module and shows how to associate the height dip switch combinations to three mV inputs 50mV 100mV 1000mV and five Tc inputs Tc J K R S N Tab 1 1i Cel H tJ po po 0 LO 11 Tos B tess t ira TO o 31 1 TR TON i o o fres 1 o d 1 TcN 1 1 o fiom tl 14 500 mV In any case it is sufficient to set the desired data in the PRO6000 program and the table will be automatically creat
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